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Chemistry LibreTexts

1: General Background on Molecular Spectroscopy

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  • Learning Objectives

    After completing this unit the student will be able to:

    • Explain what it means to use spectroscopic methods for qualitative and quantitative analysis.
    • Identify the terms in and describe deviations to Beer’s Law.
    • Describe the effect of changing the slit width and the impact it will have on qualitative and quantitative analyses.
    • Qualitatively determine the relative error in absorbance measurements and determine the optimal range for measurement purposes.
    • Describe the desirable features of a radiation source. 6. Explain the advantages of a dual versus single-beam spectrophotometer.
    • Explain the difference between a 3- and 4-level laser and why it is not possible to have a 2-level laser.
    • Compare the output of and advantages of prisms and gratings as dispersing elements.
    • Explain how a photomultiplier tube works.
    • Explain how an array detector works and describe the advantages of using an array detector.

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